[doveman2]

On Raspbian you can install the stress package which can help test the CPU and memory. Testing the GPU overclock is trickier, Quake used to be a good test for that, maybe running omxplayer at the Raspbian command line could give an indication of stability.

Thanks. I've got a SD card which I put Raspbian on. I didn't get very far with it as it defaulted to some unreadable resolution on my TV and didn't have any options to change it but I'll dig out a lead and hook it up to my PC monitor and test.

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Video decode doesn't really stress gpu. Quake or hello_triangle2(*) are better.

(*) if force_turbo is not set then run something on arm at the same time (e.g. stress) to get arm busy enough to switch to turbo.

Thanks. I'll give that a go.